Shelf



FIG. 1 is a front, bottom, and right side perspective view of a shelf showing our new design, the components being shown broken-away to indicate indeterminate length and the broken-line depiction of a fragment of a vertical support member being for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is an enlarged top plan view thereof;

FIG. 3 is an enlarged right side elevational view thereof, the undisclosed left side being plain and unornamented;

FIG. 4 is an enlarged vertical cross-sectional view thereof, taken in the direction of line 4--4 of FIG. 2;

FIG. 5 is an enlarged vertical cross-sectional view thereof, taken in the direction of line 5--5 of FIG. 2; and,

FIG. 6 is an enlarged front elevational view thereof. 

The ornamental design for a shelf, as shown and described. 